start:java8

com/study/demo/test3_2.java

@@ -0,0 +1,23 @@
+package com.study.demo;
+
+import java.util.Scanner;
+
+public class test3_2 {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        int n = scanner.nextInt();
+        int[] a = new int[n];
+        int[] b = new int[n];
+        for (int i = 0; i < n; i++) {
+            a[i] = scanner.nextInt();
+        }
+        for (int i = 0; i < n; i++) {
+            b[i] = scanner.nextInt();
+        }
+        int sum = 0;
+        for (int i = 0; i < n; i++) {
+            sum += a[i] * b[i];
+        }
+        System.out.println(sum);
+    }
+}